초록 ▼

Disclosed is a mobile communication system including a network constituted of at least one switching center and a plurality of base stations, and a mobile station which communicates with the base stations simultaneously. The system permits varying transmission delay between the switching center and

Disclosed is a mobile communication system including a network constituted of at least one switching center and a plurality of base stations, and a mobile station which communicates with the base stations simultaneously. The system permits varying transmission delay between the switching center and the base stations according to the type of services available to the mobile station. The object of the present invention is to propose a communication which permits varying transmission delay according to the type of service currently employed, and to promptly recover a synchronization state even if an out-of-sync state happens. To attain the object, a memory means (mobile switching center processor 32) stores transmission delay characteristics corresponding to services which are available to the mobile station. Furthermore, a communication timing setting means (diversity handover trunk 34) determines the timing of communication for the base stations according to the transmission delay characteristic selected according to the service.

대표청구항 ▼

The invention claimed is: 1. A diversity handover control communicating with a mobile terminal through a plurality of base stations, comprising: a forward data transmitter configured to prepare and transmit at least one frame of data, using transmission parameters, to the plurality of base stations

The invention claimed is: 1. A diversity handover control communicating with a mobile terminal through a plurality of base stations, comprising: a forward data transmitter configured to prepare and transmit at least one frame of data, using transmission parameters, to the plurality of base stations, the transmission parameters being configured to ensure substantially simultaneous transmissions of the at least one frame from the plurality of base stations to the mobile terminal, wherein the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; a reverse data receiver configured to receive timing adjustment information from at least one of the plurality of base stations, where the timing adjustment information is prepared, based on a difference between an actual arrival time of the at least one frame at the at least one base station and an estimated arrival time of the at least one frame at the at least one base station; and a synchronization adjuster configured to reconfigure at least one of the transmission parameters based on the timing adjustment information to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 2. A diversity handover control according to claim 1, wherein the transmission parameters comprise a transmission time adjustment implemented to adjust a transmission timing of the at least one frame to at least one of the plurality of base stations. 3. A diversity handover control according to claim 1, wherein the synchronization adjuster increments of the frame number to be contained in the subsequent frame. 4. A diversity handover control according to claim 1, wherein the diversity control is a diversity handover trunk. 5. A diversity handover control according to claim 4, wherein the diversity handover trunk is located in a mobile switching center. 6. A timing adjustment method implemented in a diversity handover control communicating with a mobile terminal through a plurality of base stations, the method comprising: preparing and transmitting at least one frame of data, using transmission parameters, to the plurality of base stations, the transmission parameters being configured to ensure substantially simultaneous transmissions of the at least one frame from the plurality of base stations to the mobile terminal, wherein the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; receiving timing adjustment information from at least one of the plurality of base stations, where the timing adjustment information is prepared, based on a difference between an actual arrival time of the at least one frame at the at least one base station and an estimated arrival time of the at least one frame at the at least one base station; and reconfiguring at least one of the transmission parameters, based on the received timing adjustment information to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 7. A method according to claim 6, wherein the transmission parameters comprise a transmission time adjustment implemented to adjust a transmission timing of the at least one frame to at least one of the plurality of base stations. 8. A method according to claim 6, wherein reconfiguring at least one of the transmission parameters comprises incrementing the frame number to be contained in the subsequent frame. 9. A diversity handover control according to claim 6, wherein the diversity control is a diversity handover trunk. 10. A diversity handover control according to claim 9, wherein the diversity handover trunk is located in a mobile switching center. 11. A diversity handover control communicating with a mobile terminal through a plurality of base stations, comprising: means for preparing and transmitting at least one frame of data, based on transmission parameters, to the plurality of base stations, the transmission parameters being configured to ensure substantially simultaneous transmissions of the at least one frame from the plurality of base stations to the mobile terminal, wherein the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; means for receiving timing adjustment information from at least one of the plurality of base stations, where the timing adjustment information is prepared, based on a difference between an actual arrival time of the at least one frame at the at least one base station and an estimated arrival time of the at least one frame at the at least one base station; and means for reconfiguring at least one of the transmission parameters based on the received timing adjustment information in order to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 12. A diversity handover control according to claim 11, wherein the transmission parameters comprise a transmission time adjustment implemented to adjust a transmission timing of the at least one frame to at least one of the plurality of base stations. 13. A diversity handover control according to claim 11, wherein the means for reconfiguring at least one of the transmission parameters increments the frame number to be contained in the subsequent frame. 14. A diversity handover control according to claim 11 wherein the diversity control is a diversity handover trunk. 15. A diversity handover control according to claim 14, wherein the diversity handover trunk is located in a mobile switching center. 16. A group of base stations which receive at least one frame of data from a diversity handover control and transmit the at least one frame to a mobile terminal, each base station in the group comprising: a forward data receiver configured to receive the at least one frame of data from the diversity handover control, wherein the at least one frame has been prepared and transmitted by the diversity handover control, using transmission parameters which are configured to ensure substantially simultaneous transmissions of the at least one frame from the group of base stations to the mobile terminal, and the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; an arrival time error detector configured to detect a difference between an actual arrival time of the at least one frame from the diversity handover control and an estimated arrival time of the at least one frame from the diversity handover control and to rrepare timing adjustment information based on the detected difference; and a reverse data transmitter configured to transmit to the diversity handover control the timing adjustment information, which is used by the diversity handover control to reconfigure at least one of the transmission parameters in order to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 17. A diversity handover control according to claim 16, wherein the diversity control is a diversity handover trunk. 18. A diversity handover control according to claim 17, wherein the diversity handover trunk is located in a mobile switching center. 19. A timing adjustment method implemented in each of a group of base stations which receive at least one frame of data from a diversity handover control and transmit the at least one frame to a mobile terminal, the method comprising: receiving the at least one frame of data from the diversity handover control, wherein the at least one frame is prepared and transmitted by the diversity handover control, using transmission parameters which are configured to ensure substantially simultaneous transmissions of the at least one frame from the group of base stations to the mobile terminal, and the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; detecting a difference between an actual arrival time of the at least one frame from the diversity handover control and an estimated arrival time of the at least one frame from the diversity handover control and preparina timing adjustment information based on the detected difference; and transmitting to the diversity handover control the timing adjustment information, which is used by the diversity handover control to reconfigure at least one of the transmission parameters to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 20. A diversity handover control according to claim 19, wherein the diversity control is a diversity handover trunk. 21. A diversity handover control according to claim 20, wherein the diversity handover trunk is located in a mobile switching center. 22. A group of base stations which receive at least one frame of data from a diversity handover control and transmit the at least one frame to a mobile terminal, each base station in the group comprising: means for receiving the at least one frame of data from the diversity handover control, wherein the at least one frame is prepared and transmitted by the diversity handover control, using transmission parameters which are configured to ensure substantially simultaneous transmissions of the at least one frame from the group of base stations to the mobile terminal, and the transmission parameters comprise a frame number for the at least one frame which corresponds to a transmission time of the at least one frame from each base station to the mobile terminal; means for detecting a difference between an actual arrival time of the at least one frame from the diversity handover control and an estimated arrival time of the at least one frame from the diversity handover control and preparina timing adjustment information based on the detected difference; and means for transmitting to the diversity handover control the timing adjustment information, which is used by the diversity handover control to reconfigure at least one of the transmission parameters in order to achieve synchronization of transmissions of a subsequent frame from the at least one base station and one or more other base stations to the mobile terminal. 23. A diversity handover control according to claim 22, wherein the diversity control is a diversity handover trunk. 24. A diversity handover control according to claim 23, wherein the diversity handover trunk is located in a mobile switching center.